Black Widow : forever red, by Margaret Stohl

Natasha Romanov, called the Black Widow, agent of S.H.I.E.L.D, rescues a young girl from Ivan, the man who once trained her as an assassin--and eight years later she is called upon to protect the teenager Ava has become from a threat from the past--and possibly from S.H.I.E.L.D itself

Natasha Romanov, called the Black Widow, agent of S.H.I.E.L.D, rescues a young girl from Ivan, the man who once trained her as an assassin--and eight years later she is called upon to protect the teenager Ava has become from a threat from the past--and possibly from S.H.I.E.L.D itself

Natasha Romanov, called the Black Widow, agent of S.H.I.E.L.D, rescues a young girl from Ivan, the man who once trained her as an assassin--and eight years later she is called upon to protect the teenager Ava has become from a threat from the past--and possibly from S.H.I.E.L.D itself